Connecting monaco with Yang language server

[OmReddy]

Hi,

I am having trouble to use this in my example. I am trying to connect to Yang language server (via web socket based) . I just modified few things to connect to Yang-LSP.

In client.js harcoding my yang-lsp server
function createUrl(path: string): string {
const protocol = location.protocol === 'https:' ? 'wss' : 'ws';
return normalizeUrl(${protocol}://localhost:5007);
}

languageclient does try to connect to my language server. However, the language server throwing below error...

`java.lang.IllegalStateException: Missing header Content-Length in input "GET / HTTP/1.1
Host: localhost:5007
Connection: Upgrade
Pragma: no-cache
Cache-Control: no-cache
Upgrade: websocket
Origin: http://localhost:3000
Sec-WebSocket-Version: 13
User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36
Accept-Encoding: gzip, deflate, br
Accept-Language: en-US,en;q=0.9
Sec-WebSocket-Key: 0ssCC+n3Mw6RpB2c+3COYw==
Sec-WebSocket-Extensions: permessage-deflate; client_max_window_bits

"
at org.eclipse.lsp4j.jsonrpc.json.StreamMessageProducer.listen(StreamMessageProducer.java:91)
at org.eclipse.lsp4j.jsonrpc.json.ConcurrentMessageProcessor.run(ConcurrentMessageProcessor.java:99)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)`

its asking for Content-Length
I have already gone through the whole discussion around HTTP and LSP protocol and stuff
I didn't find any fix or workaround mentioned any where.

Does it require some intermediate parser logic from yang file to stream?
Any help/guidance will be appreciated

Thank you
Om Reddy

[rcjsuen]

@OmReddy Have you tried connecting with other language servers? Do those work?

[OmReddy]

@rcjsuen the examples given with the Monaco language server are working for me
languageClient. Both examples are on JSON server.
I did my changes in json-server-launcher. So instead of JSON i am starting my Yang LSP here.
It appears everything is hooked, but when i try to send request(by modifying something in monaco editor) getting above error on server side.

[rcjsuen]

Perhaps you could try launching the YANG language server from the command line and sending things directly in from there or try connecting to it with a different language client? Or maybe not use web sockets?

The VS Code extension for YANG doesn't seem very complicated so it seems like it shouldn't be hard to start the server.

[OmReddy]

@cdietrich @tocjent
Hi Folks, sorry to bother you guys... i read the discussion you guys had on similar issue few months back 189
Can you suggest what is the work around for this

[cdietrich]

either you can add/trim the header on the server.
or you use the upcoming lsp 0.8.0-SNAPSHOT which has support for websockets directly by avoiding using StreamMessageProducer/Consumer

eclipse-lsp4j/lsp4j#314

[stale]

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